Non-native grasses alter evapotranspiration and energy balance in Great Basin sagebrush communities

Margaret R. Prater, Evan H Delucia

Research output: Contribution to journalArticle

Abstract

Over the last century non-native plants have invaded sagebrush communities of the American West. The widespread transformation from native sagebrush to invasive grassland communities as a result of wildfire will likely alter key ecosystem processes in the Great Basin, including hydrology and energy balance. To determine how this invasion may be disrupting ecosystem function, we coupled measurements of evapotranspiration (ET) and energy fluxes using the Bowen ratio-energy balance method with measurements of normalized difference vegetation index (NDVI) and plant cover in native sagebrush and adjacent post-fire bunchgrass communities in the northern Great Basin Desert over the growing season of 2003. Soil heat flux and soil temperatures were generally greater and sensible heat flux and net radiation were lower in the post-fire community compared to sagebrush. These differences increased through the summer. The post-fire community had greater ET than sagebrush in early May, likely driven by relatively high volumetric soil moisture (>20%) and greater transpiration by the developing vegetation. In June and July, ET was correlated with surface soil moisture (top 20 cm) in both communities. During late May and June, surface soil moisture was greater in the sagebrush; however, there was no difference after mid-June when soil moisture declined below 10%. By disrupting surface-atmosphere exchange in the early growing season, conversion of native sagebrush to post-fire invasive communities may disrupt hydrologic patterns in this semi-arid ecosystem.

Original languageEnglish (US)
Pages (from-to)154-163
Number of pages10
JournalHandbook of Environmental Chemistry, Volume 5: Water Pollution
Volume139
Issue number1-2
DOIs
StatePublished - Sep 21 2006

Fingerprint

Artemisia
energy balance
evapotranspiration
soil moisture
grass
basins
grasses
basin
soil water
growing season
Bowen ratio
ecosystem
net radiation
sensible heat flux
ecosystem function
energy flux
ecosystems
wildfire
NDVI
transpiration

Keywords

  • Agropyron cristatum
  • Artemisia tridentata
  • Bowen ratio-energy balance
  • Invasive plants

ASJC Scopus subject areas

  • Forestry
  • Atmospheric Science

Cite this

Non-native grasses alter evapotranspiration and energy balance in Great Basin sagebrush communities. / Prater, Margaret R.; Delucia, Evan H.

In: Handbook of Environmental Chemistry, Volume 5: Water Pollution, Vol. 139, No. 1-2, 21.09.2006, p. 154-163.

Research output: Contribution to journalArticle

@article{dadc7f92de874f7098a9b27e56fc2ecc,
title = "Non-native grasses alter evapotranspiration and energy balance in Great Basin sagebrush communities",
abstract = "Over the last century non-native plants have invaded sagebrush communities of the American West. The widespread transformation from native sagebrush to invasive grassland communities as a result of wildfire will likely alter key ecosystem processes in the Great Basin, including hydrology and energy balance. To determine how this invasion may be disrupting ecosystem function, we coupled measurements of evapotranspiration (ET) and energy fluxes using the Bowen ratio-energy balance method with measurements of normalized difference vegetation index (NDVI) and plant cover in native sagebrush and adjacent post-fire bunchgrass communities in the northern Great Basin Desert over the growing season of 2003. Soil heat flux and soil temperatures were generally greater and sensible heat flux and net radiation were lower in the post-fire community compared to sagebrush. These differences increased through the summer. The post-fire community had greater ET than sagebrush in early May, likely driven by relatively high volumetric soil moisture (>20{\%}) and greater transpiration by the developing vegetation. In June and July, ET was correlated with surface soil moisture (top 20 cm) in both communities. During late May and June, surface soil moisture was greater in the sagebrush; however, there was no difference after mid-June when soil moisture declined below 10{\%}. By disrupting surface-atmosphere exchange in the early growing season, conversion of native sagebrush to post-fire invasive communities may disrupt hydrologic patterns in this semi-arid ecosystem.",
keywords = "Agropyron cristatum, Artemisia tridentata, Bowen ratio-energy balance, Invasive plants",
author = "Prater, {Margaret R.} and Delucia, {Evan H}",
year = "2006",
month = "9",
day = "21",
doi = "10.1016/j.agrformet.2006.08.014",
language = "English (US)",
volume = "139",
pages = "154--163",
journal = "Handbook of Environmental Chemistry, Volume 5: Water Pollution",
issn = "1433-6863",
publisher = "Springer Berlin",
number = "1-2",

}

TY - JOUR

T1 - Non-native grasses alter evapotranspiration and energy balance in Great Basin sagebrush communities

AU - Prater, Margaret R.

AU - Delucia, Evan H

PY - 2006/9/21

Y1 - 2006/9/21

N2 - Over the last century non-native plants have invaded sagebrush communities of the American West. The widespread transformation from native sagebrush to invasive grassland communities as a result of wildfire will likely alter key ecosystem processes in the Great Basin, including hydrology and energy balance. To determine how this invasion may be disrupting ecosystem function, we coupled measurements of evapotranspiration (ET) and energy fluxes using the Bowen ratio-energy balance method with measurements of normalized difference vegetation index (NDVI) and plant cover in native sagebrush and adjacent post-fire bunchgrass communities in the northern Great Basin Desert over the growing season of 2003. Soil heat flux and soil temperatures were generally greater and sensible heat flux and net radiation were lower in the post-fire community compared to sagebrush. These differences increased through the summer. The post-fire community had greater ET than sagebrush in early May, likely driven by relatively high volumetric soil moisture (>20%) and greater transpiration by the developing vegetation. In June and July, ET was correlated with surface soil moisture (top 20 cm) in both communities. During late May and June, surface soil moisture was greater in the sagebrush; however, there was no difference after mid-June when soil moisture declined below 10%. By disrupting surface-atmosphere exchange in the early growing season, conversion of native sagebrush to post-fire invasive communities may disrupt hydrologic patterns in this semi-arid ecosystem.

AB - Over the last century non-native plants have invaded sagebrush communities of the American West. The widespread transformation from native sagebrush to invasive grassland communities as a result of wildfire will likely alter key ecosystem processes in the Great Basin, including hydrology and energy balance. To determine how this invasion may be disrupting ecosystem function, we coupled measurements of evapotranspiration (ET) and energy fluxes using the Bowen ratio-energy balance method with measurements of normalized difference vegetation index (NDVI) and plant cover in native sagebrush and adjacent post-fire bunchgrass communities in the northern Great Basin Desert over the growing season of 2003. Soil heat flux and soil temperatures were generally greater and sensible heat flux and net radiation were lower in the post-fire community compared to sagebrush. These differences increased through the summer. The post-fire community had greater ET than sagebrush in early May, likely driven by relatively high volumetric soil moisture (>20%) and greater transpiration by the developing vegetation. In June and July, ET was correlated with surface soil moisture (top 20 cm) in both communities. During late May and June, surface soil moisture was greater in the sagebrush; however, there was no difference after mid-June when soil moisture declined below 10%. By disrupting surface-atmosphere exchange in the early growing season, conversion of native sagebrush to post-fire invasive communities may disrupt hydrologic patterns in this semi-arid ecosystem.

KW - Agropyron cristatum

KW - Artemisia tridentata

KW - Bowen ratio-energy balance

KW - Invasive plants

UR - http://www.scopus.com/inward/record.url?scp=33947330883&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33947330883&partnerID=8YFLogxK

U2 - 10.1016/j.agrformet.2006.08.014

DO - 10.1016/j.agrformet.2006.08.014

M3 - Article

AN - SCOPUS:33947330883

VL - 139

SP - 154

EP - 163

JO - Handbook of Environmental Chemistry, Volume 5: Water Pollution

JF - Handbook of Environmental Chemistry, Volume 5: Water Pollution

SN - 1433-6863

IS - 1-2

ER -